ChapterForge

Convert folders of MP3 files into chapter-based M4B audiobooks. FFmpeg-powered conversion with configurable bitrate (64–320 kbps or VBR), sample rate, and encoding quality settings.

Drop in a folder of MP3s and ChapterForge automatically extracts metadata, chapter titles, track numbers, and artwork. Every field is editable — title, artist, album, narrator, publisher, genre, year, language, ISBN, and more. Bulk copy metadata across all chapters at once.

Drag-and-drop chapters to reorder them. Auto-number chapters, apply prefixes or suffixes across multiple selections, and find-and-replace text across all chapter titles at once.

When merging M4B files, quickly rename chapters across the entire merged project using plain text, wildcards, or regex — with case-sensitive matching and a live preview before you apply.

Queue multiple projects and let ChapterForge work through them automatically. Set high, normal, or low priority per project. Runs up to four conversions concurrently based on your hardware.

Automatically extracts embedded or folder-based artwork from your MP3 files and embeds it into the final M4B. Your audiobooks look professional in every player.

Save your work as projects and return to them later. ChapterForge remembers your metadata edits, chapter order, output settings, and folder locations exactly as you left them.

All processing happens locally on your device. No uploads, no accounts, no cloud. You retain complete ownership of your files.